Analysis starch in fibre

Carine c.

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Analysis starch in fibre

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Abstract

This document summarizes my training period at Tilbury in England. I chose this place in order to discover the English way of life and to improve my knowledge of English as well. I worked under the supervision of Andy Waterman and Tom Cripps and in collaboration with Renzi Virginie, on a method to determine the percentage of starch in fiber. The test was a very large operation with about 400 samples, in order to calibrate the method. The precision required was high and it was very important for the company that all tests had to be made with the same technician in order to have good and homogeneous results. We used a polarimeter which is used to measure the optical activity exhibited by inorganic and organic compounds.

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[...] Cerestar is the market leader in the European starch industry. (cf appendix 1 localization of Cerestar in Europe) .It supplies over three million tons of products each year to the food, paper and corrugating, pharmaceutical and chemical industries. 1.2 Their production Cerestar supplies nearly 2000 regular and modified starches and starch-based products, including maltodextrins, spray-dried glucose syrups, dextrose, sorbitol, mannitol, maltitol, xylitol, erythritol, cyclodextrins. The company is also a leader in the manufacture of glucose, high fructose syrups, caramel, citric acid, sodium citrate, wheat gluten and maize oil. [...]

[...] Graphic allows showing the repartition of starch in different samples (WS and TSS). Graphic of % starch in total starch sample Graphic of % starch in washed sample - Calculation of starch: % starch = Reading on the polarimeter * 20,000 203 * Weight of the sample - The second calculation is between the two results of rate starch (for the same sample). The difference must be under otherwise the errors of manipulation are so big and the result is rejected. [...]

[...] Reagents and their characteristics Acetic acid glacial Calcium chloride Ethanol Iodine solution Stannic chloride pentahydrate Formula C2H4O2 CaCl2 C2H5OH Mixture Sn(Cl4),5H2O Molecular weight (g/mol) 60,02 110,99 46,04 350,56 Boiling point 117,78°C >1600°C 70,28°C 100°C 113,89°C Melting point 16,67°C 782°C ?113,89°C 0°C 56,11°C Density (g/cm3) 1,05 2,15 0,79 1 2,2 Solubility Soluble in water Freely Soluble in alcohol Soluble in water Soluble in water Risk assessment Flammable causes severe burns, corrosive. Irritating to eyes, hygroscopic. Highly flammable Harmful if swallowed Causes burns, corrosive, moisture sensitive, water reactive, irritating to respiratory system. Price 433.40 £/25 Kg 13.71 £ /2.5 l 50.79 £/500 Grs 4. Preparation of solutions 4.1 Stannic chloride solution Weight accurately 10g of Stannic Chloride Pentahydrate in 80 ml of deionised water and 20 ml of glacial acetic acid. Add 100 ml of Calcium chloride solution. [...]

[...] The starch in fibre level is an indication of plant efficiency. The aim is to have a level as low as possible, average level for Tilbury is around 15 So this method brings a lot of benefits to Cerestar, and so is very important. Personal Conclusion This training period was very interesting. It was a good opportunity to improve my knowledge that I have learnt during my two years of college in Chemistry. However, three months were short to discover and use all new materials in the laboratory. [...]

[...] Dryer time is about 30 minutes at 82°C and moisture is flashed off. 2.3 InfraAlyser - Description: The BRAN+LUEBBE InfraAlyzer 2000 is a dual-beam near infrared (NIR) spectrometer which is used to analyze a wide variety of solids, semi-solids, powders and pastes, using the near infrared reflectance characteristics of the sample spectra. Several chemical or physical properties of a product can be analyzed simultaneously. InfraAlyser The drawer where the sample stays during the analysis - Operation: In the InfraAlyzer 2000, the sample is exposed to near infrared light of specific wavelengths, selected from up to 19 high-precision interference filters. [...]

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